There are proofreading symbols. Movie critics have one-to-five-stars and thumbs-up/thumbs-down rating systems. Now, Toronto illustrator, writer and queen of Venn diagrams Sarah Lazarovic has come up with shorthand for media criticism. It’s suitable for use with all subject matter, but has a couple of medical-specific symbols:
Murray's Review of Medical Journalism 
I’m going to have to borrow some of these!